COMBINED SCIENCE 0653/63

3 UCLES 2020 0653/63/M/J/20 [Turn over 1 A student investigates the effect of temperature on the uptake of water by a stem. Water containing a blue stain moves up the xylem of a plant, staining the xylem blue. Fig. 1.1 shows a cut section of the stem with stained xylem tubes. ................
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